" Can it really be true that one letter in our 3-billion-letter books of human life could be equally important? Well, yes. Boys with just a single letter change in a specific gene6 develop a devastating condition characterised by gout, cerebral palsy, mental retardation and self-mutilation of lips and fingers.7 "

― Nessa Carey , Hacking the Code of Life: How gene editing will rewrite our futures